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CVE Record

CVE-2026-22256: Salvo is vulnerable to reflected XSS in the list_html function

Salvo is a Rust web backend framework. Prior to version 0.88.1, the function list_html generate an file view of a folder which include a render of the current path, in which its inserted in the HTML without proper sanitation, this leads to reflected XSS using the fact that request path is decoded and normalized in the matching stage but not is inserted raw in the html view (current.path), the only constraint here is for the root path (eg. /files in the PoC example) to have a sub directory (e.g common ones styles/scripts/etc…) so that the matching return the list HTML page instead of the Not Found page. This issue has been patched in version 0.88.1.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-22256 is a reflected cross-site scripting issue in Salvo, a Rust web backend framework. Applications using Salvo before 0.88.1 may expose users to malicious links that run attacker-controlled script in the user’s browser when directory listing HTML is generated.

Executive priority

Prioritize remediation for internet-facing applications using affected Salvo versions, especially where users authenticate or handle sensitive data. The issue is high severity but requires user interaction and has no cited evidence of active exploitation in the provided sources.

Technical view

The flaw is in Salvo’s list_html function for folder views. It renders the current request path into HTML without proper sanitization after matching decoded and normalized paths. The CVSS 3.1 score is 8.8, with network attack vector, no privileges required, and user interaction required. Patched in Salvo 0.88.1.

Likely exposure

Exposure is likely limited to applications using salvo-rs Salvo versions before 0.88.1 and serving static directory listings through the affected list_html behavior. The advisory notes a constraint: the configured root path must have a subdirectory so the directory listing page is returned rather than Not Found.

Exploitation context

The source bundle does not indicate active exploitation, and the CVE is not marked KEV. Exploitation requires a user to interact with a crafted URL or request path that reaches the directory listing page. Business impact is mainly browser-side compromise, including potential data theft or session abuse within the affected application context.

Researcher notes

The key condition is unsafe insertion of current.path into generated directory listing HTML. Sources identify CWE-79 and CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L. Avoid assuming broader Salvo impact beyond versions before 0.88.1 and the described list_html directory listing behavior.

Mitigation direction

  • Upgrade Salvo to version 0.88.1 or later.
  • Identify applications using salvo-rs Salvo before 0.88.1.
  • Review whether static directory listing functionality is enabled.
  • Check the GitHub advisory for any updated vendor guidance.
  • Consider disabling directory listings where they are not required.

Validation and detection

  • Inventory Rust applications and dependency manifests for Salvo versions.
  • Confirm deployed builds include Salvo 0.88.1 or later.
  • Review routes serving static files with directory listing behavior.
  • Test safely in a non-production environment for reflected path rendering.
  • Monitor vendor advisory and CVE record for updates.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-22256 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L2.85.3Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-22256Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
salvo-rssalvo< 0.88.1Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.